Am I wrong to not believe in our product?

I've been doing Direct Mail Marketing for 1.5 years. I've learned tons about postage and marketing campaigns.

We've primarily worked with travel/vacation clubs. I have been given the task to grow our business.

I was cold calling for a solid month and wasn't able to gain any traction. I do believe a lot of that is me because I'm not the bubbly type of person that sounds interesting on the phone.

Previously we did nothing for lead generation and now we have 2 websites that send us leads but we're fighting them with 5 other vendors. I feel I don't have a problem closing sales but I feel I do have an issue being a prospector. I sold furniture, cable tv, and worked in collections and have done well at all my previous jobs.

I asked my boss, why don't we do any B2B Direct Mail Marketing? She said it doesn't work. We're supposed to be a lead generation company yet we don't generate any leads for us. I think this has created a mental block in my head. I'm supposed to gets (b2c) customers and sell them on mail marketing yet we don't even do it for us.

Am I wrong not to believe in our product? (sorry if this post was every were just venting and wanted some feedback)